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The original was posted on /r/todayilearned by /u/ubcstaffer123 on 2024-06-23 02:31:17+00:00.

Original Title: TIL Aristotle wrote the heart has only three chambers, and that tiny organisms can be generated spontaneously out of inanimate matter. It is now known that the left atrium is very difficult to observe and took Louis Pasteur to prove that growth doesn’t happen in a container without micro-organisms